EM 2000

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EM 2000 is a 2000W FM transmitter made up of the EM 25 DIG exciter (or EM 20/30 exciter) and the AM 2000 FM amplifier. AM 2000 includes eight 300W high-efficiency MOSFET technology amplifying modules, fed by 2 independent switching power supplies, which are made to withstand the working conditions. The amplifiying modules work independently thanks to a power combining structure that provides high isolation between them.
The equipment includes a low-pass filter at the antenna output, EMI filters at the utility connection and an internal transient suppressor. The LCD display shows the amplifier main parameters: supply voltages, 8 module currents, direct, reflected and input power, power loss in the internal unbalance load and three temperature sensors. The amplifier control system stores in their memory all events and alarms detected, showing time and date of occurrence.
Smart temperature protection: if temperature rises up to a level dangerous for the modules, the output power is reduced until the temperature goes back to a normal state. If, even with the power reduction, the temperature keeps on rising, then the amplifier is stopped until the temperature goes down.
Reflected power protection (load mismatch): when the control system detects that the V.S.W.R. is dangerous for the modules, it reduces automatically their output power so as not to exceed the internal security level. Besides, there is a fast protection system that instantaneously turns off the modules polarization when it detects a peak on the reflected power sensor.
Automatic gain control: it reduces the gain in the case of excessive driving power, keeping the adjusted output power despite temperature changes. The control allows manual power adjustment by means of the front keyboard.
The amplifier includes Analog Telemetry (Direct and Reflected power measure), Digital RS-232 telemetry and remote control, Remote control through open-close contacts and a Multi-device bus connection for internal use.

TECHNICAL SPECIFICATIONS

AM 2000
FREQUENCY RANGE 87,5 ~ 108MHz
OPERATION CLASS B
INPUT RETURN LOSS -20dB
INPUT POWER 25W
OUTPUT POWER 2000W nominal, manual and automatic adjustment
power gain 19.2dB approx.
typical RF efficiency 70%
cooling Forced air
harmonics level -80dBc
input / output impedance 50W
rf input connector N female
rf output connector EIA 7/8''
rf monitor connector BNC female
supply 190 ~ 250VAC, 50/60Hz
CONSUMption 3491,28 VA; 23A RMS; Crest factor=2.35
PROTECtions -Reflected, Forward power, overdrive, overcurrent in modules
-Smart Temperature protection
-Reflected power protection (load mismatch)
-PRFL automatic control + Fast protection
-Automatic Gain Control
-Real-time events register
-Exciter inhibition
TELEMETRY AND REMOTE CONTROL -Analog telemetry (direct and reflected power measurement)
-Telemetry and RS-232 digital remote control
-Remote control by open / closed contacts
-Multi-device bus
WORKING TEMPERATURE -5 to +40ºC
DIMENSIONS 6RU standard 19''Rack (628mm D) with no handles
WEIGHT 40Kg (88Lbs)

EM 25 DIG
S/N RATIO BETWEEN 30Hz AND 15kHz > 78dB, typical 86dB
S/N RATIO (AM ASYNCHRONOUS) > 55dB, typical >60dB
S/N RATIO (AM SYNCHRONOUS) > 50dB, typical >55dB
HARMONICS DISTORTION (75KHz deviaTion) < 0.05%, typical 0.02%
HARMONICS DISTORTION (150KHz deviaTiOn) < 0.2%, typical 0.05%
L/R STEREO CHANNELS CROSSTALK < -50dB (with external coder)
<-60dB (with internal coder, from 100Hz to 5kHz)
<-50dB (with internal coder, from 30Hz to 15kHz)
FREQUENCY RESPONSE (PROGRAM CHANNEL) ± 0.1dB (30Hz ~15kHz)
AUDIO FILTER BAND ATTENUATION > 50dB (f =19KHz)
BASE BAND LIMITER CUT Adjustable between 0 and +7dBm
FREQUENCY RESPONSE (Multiplex INPUT) ± 0.1dB (10Hz ~ 100KHz)
FREQUENCY RESPONSE (AUX CHANNEL INPUT) ± 0.2dB (10Hz ~ 100KHz)
FREQUENCY RANGE 87.5 ~ 108MHz
MODULATION TYPE FM, ± 75KHz peak dev. F3E, F8E.
CHANNEL OSCILLATOR SYNTHESIZER STEPS 10KHz
RF OUTPUT POWER Adjustable between 1 and 25WRMS
HARMONICS LEVEL < -60dBc, typical -70dBc
SPURIOUS LEVEL < -80dBc, typical -95dBc
RF OUTPUT IMPEDANCE 50Ω asymmetrical
RF OUTPUT CONNECTOR N Female
Audio/Multiplex INPUT IMPEDANCE Selectable 10KΩ / 600Ω, sym./asym.
AUDIO INPUT CONNECTOR XLR Female symmetrical
SCA/RDS INPUT IMPEDANCE 10KΩ asymmetrical
SCA/RDS INPUT CONNECTOR BNC Female
Audio/Mpx INPUT LEVEl at ±75KHz dev. Adjustable between -3.5 and +12.5dBm
SCA/RDS INPUT LEVEL at ±7.5KHz dev. Adjustable between -12.5 and +3.5dBm
SCA/RDS INPUT LEVEL at ±2.0KHz dev. Adjustable between -24 and -8dBm
MODULATION OUTPUT LEVEL 0 ~ +10dBm (for ± 75KHz dev.)
PRE-EMPHASIS TIME CONSTANT Variable 0 / 50 / 75µs ± 2%
POWER SUPPLY 115 / 230VAC ± 15%, 50/60Hz.
ConsumPTION (aT 25W OUTPUT RF POWER) 130VA / 75W
OPERATING TEMPERATURE RANGE -10 ~ +45ºC
Dimensions 2RU 19'' standard rack (483 x 88 x 334 mm)
WEIGHT 6Kg (13.2lbs)

EM 20/30
operating frequency range 87.5 ~ 108.0MHz
modulation FM CLASS F3E, F8E ( ± 75KHz maximum deviation)
VCO tuning 25MHz
frequency stability ± 2.0ppm
frequency tuning step 10KHz
RF power output 0 ~ 30Wrms adjustable
spurious < - 80dBc
harmonics < - 70dBc
STEREO CHANNEL SEPARATION > 55dB / 1KHz
T.H.D. distortion < 0.1 % / 1KHz (0.08% typical)
BaseBAND FREQUENCY RESPONSE 0.15dB from 30Hz to 60KHz
unweighted S/N ratio > 78dB from 30Hz to 15KHz (Mono input, Pre-emphasis of 50ms)
asynchronous AM S/N ratio > 65dB Ref. 100 % AM / 400Hz
synchronous AM S/N ratio > 60dB with FM / 75KHz / 400Hz
Pre-EMphasis 50 or 75ms Internally selectable
RF output impedance 50W asymmetrical N Female Connector
MPX input connector (main program) BNC Female
stereo input impedance (main program) High-Z 2KW
SCA input connectors BNC Female
SCA input impedance High-Z 2KW
Remote control interface Serial RS-232
cooling Air forced (Axial blower)
operating temperature range - 10 ~ + 45ºC
maximum relative humidity 90% (without condensation)
AC power supply 110/240VAC, 47/63Hz
Dimensions 2RU (19" rack), 410mm depth
weight 4.8Kg (10.56lbs)

AMPLIF + EXCITER + RACK
DIMENSIONS 540 x 660 x 610mm. (21.26 x 25.98 x 24.04 inches)
WEIGHT 132Lbs (60kg)